Audio amplifier



FIG. 1 is a front perspective view of an audio amplifier, showing my new design with an audio cord in a stowed configuration;

FIG. 2 is a front elevational view of FIG. 1;

FIG. 3 is a rear elevational view of FIG. 1;

FIG. 4 is a left-side elevational view of FIG. 1;

FIG. 5 is a right-side elevational view of FIG. 1;

FIG. 6 is a top plan view of FIG. 1;

FIG. 7 is a bottom plan view of FIG. 1;

FIG. 8 is a rear perspective view thereof, illustrated with the audio cord in an extended configuration; and,

FIG. 9 is a bottom perspective view of FIG. 1. 

I claim the ornamental design for an audio amplifier, as shown and described. 